Half to l



(No Model.)

T. P. SILKWOOD.

NUT LOOK. v No. 393,725. 4 Patented Nov. 27, 1888 UNITED STATES PATENT OFFICE.

THOMAS PIM SILKWOOD, oF BLUFF DALE, ILLINOIS, ASSIGNOR OF ONE: HALF r0 L. D. FOREMAN, 0F SAME PLACE.

NUT-LOCK.

SPECIFICATION forming part ofLetters Patent No. 393,725; dated November 27, 1888.

Application filed July 13, 1888.

To aZZ whom, it may concern.-

Be it known that LTHOMAS PIM SILKWOOD, a citizen of the United States, residing at Bluff Dale, in the county of Greene and State of Illinois, have invented a new and useful Improvement in Nut Locks, of which the following is a specification.

The invention relates to improvements in nut-locks; and it consists in the construction and novel combination of parts, hereinaiter described, illustrated in the accompanying drawings, and pointed out in the appended claimst,

Figure 1 of the drawings represents a perspective view of a nutlock embodying the invention. Fig. 2 represents a vertical section on the line a: x of Fig. 1. Fig. 3 represents a perspective view of the key detached. Fig. 4. represents a perspective view of the inner nut detached. Fig. 5 represents a longitudi nal view of a modification in which the device is attached to an unthreaded rod,bar, or shaft. Fig. 6 represents a modification in which the ends of the bifurcated outer nut are closed.

The device is intended for use not only to look a nut 0n bolts, but also to lock collars on smooth shafts. The operation is, however, the same in all cases.

Referring to the drawings by letter, A designates a bolt of common construction, upon which is engaged the inner nut, B, also of commonconstruction.

O is a bifurcated nut, composed of the side plates, 0 c, and the uniting top plate, a. The plates 0 0 stand closely against the nut B, on opposite sides thereof, and are provided with threaded openings D, which register with each other and with the threaded opening D of the inner nut, B,when the upper edge of said not is a suitable distance from theinner surface of the plate 0 to form the keyway E.

F is a key, tapered from one end to the other,

as shown, and adapted to be inserted into the keyway E. When the bolt is inserted through the openings D D, the thinner end of the key F is inserted into the keyway E and the key Serial No. 279,820. (No model.)

driven home with ahammer. The said thinner end then projects out of the keyway on the opposite side of that on which it entered, so that the key can be also released by the hammer. The key when driven inward binds the inner nut down on the bolt and prevents the latter from turning in the nut. When the ends as the outer nut are closed, as in Fig. 6, the inner nut must be inserted between the plates 0 from below, and the key is then passed into the openings or slots G G in said plates to bind on the inner nut.

In place of the key F a set-screw, H, may be passed through a threaded opening in the top plate, 0, so that the end of its shank will impinge 0n the inner nut and cause it to bind on the bolt or rod. The key, however, is preferable, as it can be used with greater ease and rapidity.

Having described my invention, I claim- 1. The combination, in a nut-lock, of the inner nut, of common construction, the outer bifurcated nut provided with side plates that rest against the opposite sides of the inner nut and forming with the inner nut,when the bolt-holes of the two nuts register, a space between the upper edge of the inner nut and the inner surface of the top plate of the outer nut, and means, substantially as specified,whereby the inner nut may be forced downward to bind on the bolt and prevent the rotation thereof, substantially as specified.

2. In a nut-lock, the combination of the inner nut, the outer bifurcated nut embracing the sides of the inner nut and provided with the unitingplate c, and the tapered key inserted between the plate 0 and the adjacent edge of the inner nut, substantially as and for the purpose specified.

In testimony that Iclaim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

THOMAS PIM SILKWOOD.

Vitnesses:

NORA RUssELL, PAULINE RUssELL. 

